Stoker mechanism.



P. L. CRDWE.

STOKER MECHANISM.

APPLICATION FILED SEPT. 24, 1907.

Patented June 21, 1910.

I N INVENTOR,

Wmw; i z 1? Allvmqzv.

P. L. GROWE.

STOKER MECHANISM.

APPLICATION rum) SEPT. 24, 1901.

962,322. Patented June 21; 1910.

WJTJ ES l INVENTbR,

'%'7" 3,, @MQQW UNITED sin-figs PATENT OFFICE.

PRU: L. CRGWE, F JERSEY CITY, NEW JERSEY.

STOKER MECHANISM.

To all whom it may concern:

Be it known that i. l.\t'i. L. (,nowr. a citizen of the lfnitetl States,residing at Jersey ('it in tho eonnrv of lludson 1nd State. of KenJersey. have invented certain new and useful improvements in StokerMechanism: and l do hereby declare the following to he a full. clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to stokers for furna es and the like, and has foran object to provide a toker of improved design emhod ving improvedt'eatures of economy, hoth .ot' fuel and. lahor.

. A further o ject ot' the invention is to provide in :1 stoker a frameof improved construction adapted to support a traveling grate mountedthereon.

further ohject of the invention is to provide in a. device of the classa traveling grate emhod ving new and improved features. lmth in thematter of the grate hat and the connection with the traveling membQlS.

A further ohject of the invention is to provide in :1 stoker improvedmeans for admitting :"uei to the conthttstion chamhcr.

further ohject ot the invention is to provide in :Lstttlitt' an improved:t'orm of c|eanout door.

it further ohjeet ot' the invention is to provitt in a stoker animproved torn: of radia in arch.

With these and other objects in viewfthc inventi n compri es certainnovel constructions. comhinatious and arrangements of parts. as will hehereinat'tertnlly described and claimed.

in the drawings: Figure 1 is a view of the stoker showing the frame inside elevation with parts hroken away to exhihit the internalconstruction and showing the radiatiug arch in section. Fig. 2 is a viewin end elevation of the stoker as taken along arrow 2 of Fig. l with parte broken away to Sllfll the internal construction. Fig. 3 is aperspective. view of one of the grate hars. Fig. i is a perspective viewof the end roller over which the traveling grate passes. Fig. 5 is :1view in vertical transverse section of a pair of associated grate bars.Fig. 6 is :1 perspective view of the fuel controlling means. Fig. 7 is aview in side elevation of one of the sprockets over which the travel-Specitication of Letters Patent.

Application filed September 24. 1907.

Patented June 21, 1910. Serial No. 394,390.

ing grate passes and from which it receives motion. Fig. 8 is a verticalsectional view of one of the improved sprockets taken on line 8 of Fig.7. Fig. 9 is a fragmentary view of one end of a grate bar showing theshoe meaus for attachment to the traveling chain. Fig. 10 is afragmentary view of the ends of the grate bar opposite to that shown atFig. 9 and showing means for atitlt'llllt." the grate bar to ahorizontal link of the chain.

Like characters of reference designate corresponding parts throughoutthe several \HWYH.

The improved stoker forming the subjectmatter of this applicationcomprises a frame composed of side pieces and 16, prefera lv composed ofbar metal, the latter being disposed beneath the former and inclinedrelative thereto with the rear or back end of the frame spaced widerthan the front end. The frame pieces 15 and 16 are supported andtttllttl together and Spaced by means of struts 17 at the rear end ofthe furnace. aml the supporting frame members 18 at the frontend of thefurnace. It is to he understood that the stoke", of which the frameforms a part, is set within the comhustion chamber 19 of a furnace forheating any approved object, as the conventional boiler :20 and thefront end of the furnace is closed by means of a plate 21 forming alsothe. front or outer end of the stoker. The frame pieces 15 and lti arealso spaced apart adjacent their forward end by means of a trut 32 andbetween the frame )ieces forming the opposite sides of the stoljournaled a roller '23 shown at Fig. 4 in perspective by the shaft ortrnnnions 24, and with a'shat't 25 journaled at or adjacent the forwardend of the frame and carrying upon opposite ends sprockets 26 shown indetail in Figs. 7 and 8 and over which sprockets chains 27 are moved byrotating the shaft It will he noted that the chain 27 comprisesalternating vertical and horizontal links which are maintained in suchrelative positions by the formation of the sprockets 26 as shown. 'lrmisverscly between the chains 27 are disposed grate bars 28, each ofsaid lJtll'S having at one end a ter is hook 2Q proportioned to beinserted through one of the vertical links of the chain 27 and at itsopposite end with registering recesses 30 proporhoned to recelve uponopposite sides hooked engaging members 31 adapted,

to hook throu h and en a e one of the hori- U C D zontal links of thechain 27, as shown at 5 Fig. 10.

Ihe grate bar 28 18 provided with a web 32 of such conformation as toconform substantially with the external curvature of the j roller 23 sothat as the said grate bars 28 carried by the chains 27 pass over thesaid roller 23, practically all of the air is shut 3 off and is,therefore, obliged to pass through the grates while traveling upon theupper side and the length of the stoker.

Beneath the rearward end of the stolter 5 and beneath the roller 23 anash space 33 is provided terminating at the bottom in any j approvedmeans for discharging the ash as the chute 34. Spaced transverselybeneath the frame pieces 16 are a plurality of rollers 35 journaled uponshafts 36 adapted to carry the traveling grate in its return movementand inverted position, and against the rearward one of said rollers 35 ahinged plate 37 is arranged to hear at its upper end to close thepassage beneath the Stoker and to prevent ash from passing therethrough,also to practically shut off the air from passing beneath the stoker andthrough the ash space 33 into the combustion chamber 19. The door orplate 37 is pivoted above the center and held in closed position by theweight of its lower part, so that any clinkers or any inequalities maypass through and supported upon springs 38 which maintain the saidroller in yielding contact with the under side of the traveling grate bywhich arrangement clinkers may also pass by the said roller as well asthe said door without fracturing or straining the structure.

To carry and support the upper or fuel supporting surface of thetraveling grate a plurality of rollers 39 are employed journalcd uponshafts or trunnions 40. the said shafts androllers being alinedlongitudinally of the. frame but owing to the fact that the chain 27comprises alternate horizontal and vertical links, it will be seen thatas the said chain passes over the rollers 39, the links will raiseportions of the said chain and the grate bars connected with suchportions as indicated by' the arrows 41 in Fig.

1, so that the movement of the traveling grate is undulatory, keepingthe fuel thereupon in a loosened condition and preventing undue cokingand concentration of the fuel.

Above the forward end of the traveling grate a. hopper 42 is supportedin any approved manner as by the frame pieces 18 and in the lower openendof said hopper is journalcd a segmental controlling device shown inperspective at Fig. 6 and embodying end plates or disks 43 havingtrunnions 44 extending in opposite directions axially therefrom andjournaled in the end walls of the hopper. Between the disks :1 segmentalplate -14 is provided proportioned to close the opening 45 in the lowerside of the hop- 5 per. and a shield or batlle plate 46 is mountf edwithin the hopper having a curved plate 47 proportioned and positionedto permit I the segmental plate -14 to pass in the rear E thereof and tobe protected in such movement thereby and by the battle plate 46, sothat the controlling device may be rotated i in the direction indicatedby the arrow without the segmental plate A engaging with and beingstopped by the fuel contained in the hopper. Upon the end of one of thettrunnions 4-t and without the stoker and furnace structure, a weight 48is mounted Z adapted to hold the feeding device normally closed.

[ Beneath the feed opening 45 a feed plate -19 is pivoted as by theshaft 50 journalcd in the stokcr or furnace structure and preferably inthe frame piece 18 and upon the said shaft 50 a weight 51 is mounted ofsuch proportion and in such manner as to equalize the weight of the feedplate provided also with a handle 52 for convenience of manipulation andwith a catch or detent .33 positioned to hold the door normally inclosed position. i front plate 21 of the stolter and furnace is curvedover the end of the stoker and cxtended as at 53 beneath the lower edgeof the feed plate.

To the rear of the rear wall of the hopper 42 a radiating art-h 5G isprovided comprising a plurality of sections as indicated 5 in dottedlines in Fig. 2 being formed keyed in the well known manner of archconstruction and with bolts 57 disposed between and their heads embeddedin adjacent sections and extending through the rear plate of the hoppersecuring the arch thereto. To further support the arch skcwbacks 58extend outwardly from the inclosing walls of the furnace and providedwith inclined surfaces proportioned to engage the extremities of theblocks and support the arch.

The lower edge of the rear wall 5:: of the hopper is curved as at 58' toinclose a cooling device shown conventionally at 59.

The grate bars 28 comprise preferably a bar portion supported upon theweb 32 and with the fingers of the grate 59 extending only upon one sideof the bar portion and normally approximately in engagement with thenext adjacent bar and positioned to vary if there is a movement of thechain upon the inclined side of the bar to prevent one bar settlingmaterially below the adjacent bar.

In operation it will be understood that fuel is admitted. by rotatingthe segmental Itwill be seen that thecontrol in the direction indicatedby the passes obliquely downward upon the surface of the traveling gratecomprising the chain 27 and the grate bars 28. The traveling grate asit. passes over the rollers 39 is given an undulatory movement in themanner aoove described and air is forced into the stokcr beneath thegrate and fed through the traveling grate in the usual well known mannerso that the fuel upon the surface of the traveling grate is consumed asthe grate travels from front to rear. It, is, of course, designed tomove the grate at suclr a rate that the fuel will be entirely consumedbefore it reaches the rear end so that. nothing but ash is dischargedover the rear end of the traveling grate and air is prevented frompassing in any grczg' quantities from beneath the stoker through the ashspace 33 by reason of the formation of the roller 23 and theinterposition of the pivoted plate 37.

The feed plate, as implied by its name,

serves not only to direct the flow of fuel from the feed opening 45 tothe traveling grate, but also, in case. of necessity, to permit; accessto the interior of the combustion chamber, and to the Stoker.

The radiating arch formed as described of the keyed segments is found tobe a very important feature of the present invention, especially inconnection with the means for supporing such keyed segments comprisingthe bolts 57 extended through the rear plate or wall of the hopper andalso the skewbacks which are rigid or integral with the inclosing wallof the furnace adapted to support the opposite ends of the arch andowing to its keyed structure supporting thereby the entire arch whenheld in engage ment by the bolt.

\Vhat I claim is 1. The combination with a furnace having a gratesurface and ignition arch above the grate surface, of skowbacks mountedat the side of the furnace and extending the depth of the arch, saidarch comprising keyed blocks the depth cf the arch, all selfsupportingupon and between the skewbacks, a member arranged transversely of theouter face of the arch, and retaining means connecting each of theblocks with such transverse member.

:2. The combination with a furnace having a grate surface and anignition arch above the grate surface, of skewbacks mounted at the sidesof the furnace and extenl'ling the depth of the arch, said archcomprising keyed blocks the depth of the arch, all selfsupporting uponand between thev ken' backs and forming a continuous plain under surfacethroughout the transverse extentof the ar h, a member arrangedtransversely of the outer face of the arch, and retaining meansconnecting each of the blocks with 3. The combination with a furnacehaving a grate surface and ignition arch above the grate surface, ofskewbacks mounted at the sides of the furnace and extending the depth ofthe arch, said arch comprising keyed blocks the depth of the archself-supporting upon and between the skevvbacks, a hopper, and boltssecured betwcen adjacent key ed blocks and securing the hopper to thearcn.

4. The combination with a furnace having a grate surface and ignitionarch above the grate surface, of skeWb-acks mounted at the sides of thefurnace and extending the depth of the arch, said arch comprising keyedblocks the depth of the arch all self-supporting upon and between theskewbacks, and forming a continuous plain under surface throughout,the'transverse extent, of the arch, a hopper, and bolts secured betweenadjacent keyed blocks and securing the hopper to the arch.

In testimony whereof I afiix my signature in presence of two witnesses.

PAUL L. cno'wn.

\Vitnesses Anna E. Din'rz, Emrn S. I{INNEY.

